BUS308 Week 2 Quiz - 100% Solution

1.            Question :           In the application of Bayes' Theorem the sample information is combined with prior probabilities to obtain posterior probabilities.

                :                                True

                                                 False

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 2.           Question :           The actual weight of hamburger patties is an example of a continuous random variable.

                :                                True

                                                 False

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 3.           Question :           A student's grade on an examination was transformed to a z value which is negative. Therefore, we know that he scored

                :                               higher than 16% of the class.

                                                 higher than 45% of the class.

                                                 above the first quartile.

                                                 below the mean.

                                                 above the mean but below the median.

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 4.           Question :           The expected value of a discrete random variable is:

                :                               ∑x p(x)

                                                 n ∙p ∙q

                                                 ∑(x - µx)2 p(x)

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 5.           Question :           The following formula: P(A U B) = P(A) + P(B) - P(A ∩ B) represents

                :                               the conditional probability.

                                                 the addition rule.

                                                 independence.

                                                 the multiplication rule.

                                                 None of the above.

                                0 of 1

 6.           Question :           A standard normal distribution has a mean of ____and standard deviation of ____

                :                               zero, zero.

                                                 zero, one.

                                                 one, one.

                                                 one, zero.

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 7.           Question :           A(n) __________ is a measure of the chance that an uncertain event will occur.

                :                               experiment

                                                 sample space

                                                 probability

                                                 complement

                                                 population

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 8.           Question :           The MPG (mileage per gallon) for a mid-size car is normally distributed with a mean of 32 and a standard deviation of .8. What is the probability that the MPG for a selected mid-size car would be less than 33.2?

                :                               43.32%

                                                 6.68%

                                                 93.32%

                                                 86.64%

                                                 13.36%

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 9.           Question :           For a Poisson random variable the mean and the variance equal the average number of occurrences over the time interval (µx = ó2x = µ)

                :                                True

                                                 False

                                0 of 1

 10.         Question :           In a statistical study, the random variable X = 1, if the house is colonial, and X = 0 if the house is not colonial, then it can be stated that the random variable is continuous.

                :                                True

                                                 False